how to implement word count bash shell
- by codemax
hey guys.
I am trying to write my own code for the word count in bash shell.
I did usual way. But i wanna use pipe's output to count the word.
So for eg the 1st command is cat and i am redirecting to a file called med.
Now i have to use to 'dup2' function to count the words in that file. How can i write the code for my wc?
This is the code for my shell pgm :
void process( char* cmd[], int arg_count )
{
pid_t pid;
pid = fork();
char path[81];
getcwd(path,81);
strcat(path,"/");
strcat(path,cmd[0]);
if(pid < 0)
{
cout << "Fork Failed" << endl;
exit(-1);
}
else if( pid == 0 )
{
int fd;
fd =open("med", O_RDONLY);
dup2(fd ,0);
execvp( path, cmd );
}
else
{
wait(NULL);
}
}
And my wordcount is :
int main(int argc, char *argv[])
{
char ch;
int count = 0;
ifstream infile(argv[1]);
while(!infile.eof())
{
infile.get(ch);
if(ch == ' ')
{
count++;
}
}
return 0;
}
I dont know how to do input redirection
i want my code to do this :
When i just type wordcount in my shell implementation, I want it to count the words in the med file by default.
Thanks in advance
